diff --git a/bin/os-detect b/bin/os-detect
new file mode 100755
index 0000000..9e86cca
--- /dev/null
+++ b/bin/os-detect
@@ -0,0 +1,13 @@
+#!/usr/bin/env sh
+
+# detect os platform
+OS_TYPE="$(uname -s)"
+case "${OS_TYPE}" in
+  Linux*) sort_command=sort grep_command=grep;;
+  Darwin*) sort_command=gsort grep_command=ggrep;;
+  CYGWIN*) sort_command=sort grep_command=grep;;
+  OpenBSD*) sort_command=sort grep_command=grep;;
+  FreeBSD*) sort_command=sort grep_command=grep;;
+  *) sort_command="UNKNOWN" grep_command="UNKNOWN";;
+esac
+
diff --git a/bin/zkt b/bin/zkt
index ac9e821..c92fd89 100755
--- a/bin/zkt
+++ b/bin/zkt
@@ -1,15 +1,23 @@
 #!/bin/bash
-zkt-raw | fzf --height 100% --no-info --no-multi \
-  --bind "ctrl-o:execute-silent[tmux send-keys -t \{left\} Escape :read Space ! Space echo Space && \
-          tmux send-keys -t \{left\} -l '\"\\'{2}'\"' && \
-          tmux send-keys -t \{left\} Enter]" \
-  --bind "ctrl-y:execute-silent(echo {2} | pbcopy),enter:execute[ \
-    ggrep -F --color=always -i {2} *.md -l | \
-      fzf --ansi --height 100% --preview-window=top:65% \
-        --bind 'enter:execute-silent$ \
-          tmux send-keys -t \{left\} Escape :e Space && \
-          tmux send-keys -t \{left\} -l \{} && \
-          tmux send-keys -t \{left\} Enter \
-        $' \
-        --preview 'bat --color always --language md --style plain \{}' \
-  ]"
+
+# load os detect script
+. os-detect
+
+case "${grep_command}" in
+  UNKNOWN*) echo "support only unix system";;
+  *)
+  zkt-raw | fzf --height 100% --no-info --no-multi \
+    --bind "ctrl-o:execute-silent[tmux send-keys -t \{left\} Escape :read Space ! Space echo Space && \
+            tmux send-keys -t \{left\} -l '\"\\'{2}'\"' && \
+            tmux send-keys -t \{left\} Enter]" \
+    --bind "ctrl-y:execute-silent(echo {2} | pbcopy),enter:execute[ \
+      ${grep_command} -F --color=always -i {2} *.md -l | \
+        fzf --ansi --height 100% --preview-window=top:65% \
+          --bind 'enter:execute-silent$ \
+            tmux send-keys -t \{left\} Escape :e Space && \
+            tmux send-keys -t \{left\} -l \{} && \
+            tmux send-keys -t \{left\} Enter \
+          $' \
+          --preview 'bat --color always --language md --style plain \{}' \
+    ]";;
+esac
diff --git a/bin/zkt-raw b/bin/zkt-raw
index d675c8a..19e018d 100755
--- a/bin/zkt-raw
+++ b/bin/zkt-raw
@@ -1,6 +1,14 @@
 #!/bin/bash
 # useful for editors, used in zkt
-rg -o "#[\w\-_]{3,}" -t md -N --no-filename "$ZK_PATH" |
-  rg -v "^#(notes-|import-)" | \
-  awk ' { tot[$0]++ } END { for (i in tot) print tot[i], "\t", i } ' | \
-  gsort -r --numeric-sort
+
+# load os detect script
+. os-detect
+
+case "${sort_command}" in
+  UNKNOWN*) echo "support only unix system";;
+  *)
+    rg -o "#[\w\-_]{3,}" -t md -N --no-filename "$ZK_PATH" |
+      rg -v "^#(notes-|import-)" | \
+      awk ' { tot[$0]++ } END { for (i in tot) print tot[i], "\t", i } ' | \
+      ${sort_command} -r --numeric-sort;;
+esac